Missing Original VIN

Test 1 - 2:

Test 3 - 5:

Test 6:

SYMPTOM
MISSING ORIGINAL VIN

WHEN MONITORED
The first time a new ACM is powered up it monitors the PCI Bus for 2 consecutive identical VIN messages. The complete VIN is then permanently stored into memory and the 6th digit is used to identify a light duty (1) or heavy duty (2, 3 or 4) vehicle.

SET CONDITION
If a ACM does not receive two consecutive identical VIN messages within 5.6 seconds. The active DTC will be cleared once two consecutive identical VIN messages are received.

POSSIBLE CAUSE
- PCM, PCI communication failure
- PCM vehicle identification numbers incorrect or missing
- ACM calibration mismatch
- Stored code or intermittent condition
- Active code present